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Sintering of Pd Automotive Catalysts

Published online by Cambridge University Press:  02 July 2020

Q. Xu ,
K.C.C. Kharas  and
A.K. Datye
Q. Xu
Affiliation:
University of New Mexico, Department of Chemical and Nuclear Engineering, Albuquerque, NM, 87131, USA
K.C.C. Kharas
Affiliation:
Delphi-ASEC Environmental Catalysts, Tulsa, OK, 74015, USA
A.K. Datye
Affiliation:
University of New Mexico, Department of Chemical and Nuclear Engineering, Albuquerque, NM, 87131, USA
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Abstract

The focus of this work is on processes that lead to loss of active metal surface area during high temperature operation of automotive catalysts. As under-floor catalytic converters are moved closer to the engine to achieve faster light off, the catalyst is subjected to higher operating temperatures during the normal driving cycle. Sintering of the active metal phase leading to loss of surface area represents one of the most important factors limiting the long-term durability of automotive catalysts. Despite its obvious technological importance, fundamental understanding of sintering is still lacking.

In this research, we have prepared a series of Pd metal catalysts on a θ alumina support. The metal loading was varied from 1.1 wt% to 7 wt%. The catalysts were subjected to sintering at 900 °C for up to 192 hours. To ensure relevance to automotive catalysts, the sintering was performed in a gas atmosphere that contained 10 mol % H2O in flowing N2 or in air.

Type
Characterization of Catalysts (Organized by S. Bradley)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1080 - 1081
Copyright
Copyright © Microscopy Society of America 2001

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References

1. Granqvist, C.G. and Buhrman, R.A., Size Distributions of Supported Metal Catalysts: Coalescence Growth versus Ostwald Ripening. J. Catal., 1976. 42: p. 477–479.Google Scholar

2. Financial Support from the National Science Foundation, GOALI program grant number CTS 99- 11174 and from Delphi-ASEC Environmental CatalystsGoogle Scholar